namespace trakker.Utilities
{
    internal class DateTimeExtensions
    {
        public static DateTime EndOfWeek(DateTime dt, DayOfWeek startOfWeek = DayOfWeek.Monday)
        {
            // Normalize to date (ignore time for week math)
            var date = dt.Date;

            // Compute offset from the configured startOfWeek
            int diff = (7 + (date.DayOfWeek - startOfWeek)) % 7;

            // Start of this week
            var start = date.AddDays(-diff);

            // End of this week: start + 6 days, then set to end-of-day
            var endDate = start.AddDays(4);

            // End-of-day with max precision (DateTime has 100-ns ticks)
            return endDate.Date.AddDays(1).AddTicks(-1);
        }

    }
}